JPH1089832A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve cooling performance of a deep freezing chamber and cold storage chamber applied with load in the case of applying large load to the freezing chamber or storage chamber in a refrigerator having a return duct for returning cold air in the freezing chamber and storage chamber to an evaporator. SOLUTION: A return duct 50 is partitioned to be constituted to a duct 54 for a deep freezing chamber 12, a duct 56 for a cold storage chamber 16, and a common duct 58 having suction ports 59, 60 of both the chamber 12 side and chamber 16 side, and the ports 59, 60 of the duct 58 are switched. Thus, the duct 58 can be switched for the freezing chamber or the storage chamber. Normally, the duct 58 is used as the duct for the freezing chamber. If the temperature of the chamber 16 rises, the duct for the storage chamber is switched, cold air volume and heat exchanger area of the chamber 15 side are increased, thereby improving cooling performance of the chamber 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a refrigerator, and more particularly to a duct structure thereof.

[0002]

2. Description of the Related Art A conventional refrigerator duct structure will be described with reference to a so-called mid-freezer type refrigerator 10 shown in FIGS.

The refrigerator 10 has horizontal partitions 18, 2
0, the freezer compartment 12 in the center and the refrigerator compartments 1 above and below it
Refrigeration compartment 16 at the bottom.
Is usually a vegetable room.

In the refrigerator 10, an evaporator 24 and a fan 26 are arranged in a duct 22 behind the freezing compartment 12.
The cool air generated by the fan 26 is blown by the air duct 30a,
Each of the outlets 32a, 32b, 32 through 30b, 30c
c, the air is blown into each of the chambers 12, 14, and 16, and the blown cool air is sent back to the evaporator 24 via the return duct 100 to circulate cool air.

[0005] That is, in the freezing room 12, cool air is blown into the room through air outlets 32 a provided on the upper surface and the rear surface thereof, and the cool air flows into the partitioning section 20 between the freezing room 12 and the vegetable room 16. It is returned to the evaporator 24 from the provided return duct 100.

In the refrigerator compartment 14 and the vegetable compartment 16, the cold air generated in the evaporator 24 is first guided to a ventilation duct 30 b provided on the back of the refrigerator compartment 14, and is blown into the refrigerator compartment 14 from an outlet 32 b. You. Then, the air outlet 3d is provided at the lower end of the refrigerator compartment 14 through a connection air blow duct 30c behind the freezer compartment 12 from a suction port 32d provided at the bottom of the rear surface of the refrigerator compartment 14.
It is blown out to the vegetable room 16 from 2c. The cool air blown out to the vegetable compartment 16 is returned to the evaporator 24 via the return duct 100. In addition, the air duct 3 of the refrigerator compartment 14
A damper 36 for adjusting the air volume (temperature adjustment) is attached to the entrance at the lower end of Ob.

FIG. 12 shows the structure of a conventional return duct 100.

[0008] The return duct 100 is divided into three rows by two ribs 102, 102 extending in the front-rear direction. Ducts 104, 104 on both sides thereof are freezer compartment ducts having suction ports 106, 106 opening toward the freezer compartment 12 at the front end of the partition 20.
From 6, the cool air in the freezing room 12 is sucked and sent back to the evaporator 24. The duct 105 at the center is a refrigerator compartment duct having a suction port 107 opening toward the vegetable compartment 16 at the front end of the partitioning section 20, and sucks cool air in the vegetable compartment 16 from the suction port 107 to the evaporator. Send it back to 24. Then, as shown in FIG. 12 (b), the cold air returned from the freezer compartment ducts 104 on both sides is subjected to heat exchange between the two sides S, S of the evaporator 24, and is supplied to the central refrigerator compartment. Duct 10
The cool air returned from 5 is subjected to heat exchange at the center of the evaporator 24.

[0009]

In the above-mentioned conventional return duct 100, the duct 1 for the freezer compartment and the refrigerator compartment 1
Both 04 and 105 have a fixed shape, and the air volume is constant under any load condition. Also, the cool air from the return duct 100 passes through the evaporator 24,
Even when heat exchange is performed, the heat exchange area is substantially the same in both cases, so that only a certain amount of heat exchange can be obtained. Therefore, it is difficult to obtain sufficient cooling performance when a large load is applied to one of the freezer compartment 12, the refrigerator compartment 14, and the vegetable compartment 16 due to an excessive rise in room temperature or the like. There is a problem.

Accordingly, an object of the present invention is to provide a refrigerator capable of improving the cooling performance of a room where a load is applied when a large load is applied to the freezing room or the refrigerator compartment.

[0011]

According to the present invention, there is provided a refrigerator having a return duct for returning cold air in the freezer compartment and the refrigerator compartment to the evaporator, wherein the return duct has a suction port on the freezer compartment side. A freezer compartment duct having a suction port on the refrigerator compartment side, and a common duct having both suction ports on the freezer compartment side and the refrigerator compartment side, and open and close the suction port of this common duct. Thereby, the common duct can be switched between a refrigerator room and a refrigerator room.

In the above description, the common duct is usually one of the suction ports on the freezer compartment side and the refrigerator compartment side opened and the other closed.
When a large load is applied to the other chamber due to, for example, a rise in the temperature of the other chamber, the common duct is opened by opening the suction port on the other side and closing the suction port on the one side. Switch to a new duct. Thereby, the air volume of the cold air on the other side is increased, and the heat exchange area in the evaporator is increased, so that the cooling performance of the chamber on the other side is improved.

According to a second aspect of the present invention, there is provided a refrigerator having a return duct for returning cold air in the freezer compartment and the refrigerator compartment to the evaporator,
The return duct comprises a freezer compartment duct having a freezer side suction port, and a common duct having both freezer side and refrigerating room side suction ports, by opening and closing the suction port of the common duct. The common duct is switchable between a refrigerator room and a refrigerator room.

In the above, the common duct is usually a duct for the refrigerator compartment, and when a large load is applied to the refrigerator compartment, the return duct is switched to the duct for the refrigerator compartment so that the return ducts are all for the refrigerator compartment. As a result, the amount of cool air on the freezer compartment side increases, and the heat exchange area in the evaporator increases, thereby improving the cooling performance of the freezer compartment.

According to a third aspect of the present invention, the refrigerator includes a return duct for returning cold air in the freezing room and the refrigerator room to the evaporator,
The return duct comprises a refrigerator compartment duct having a refrigerator compartment side suction port, and a common duct having both a freezer compartment side and a refrigerator compartment side suction port, and by opening and closing the suction port of this common duct. The common duct is switchable between a refrigerator room and a refrigerator room.

In the above description, the common duct is usually a duct for a freezer compartment, and when a large load is applied to the refrigerator compartment, the return duct is switched to the duct for the refrigerator compartment so that all the return ducts are for the refrigerator compartment. As a result, the amount of cold air on the refrigerator compartment side increases, and the heat exchange area in the evaporator increases, thereby improving the cooling performance of the refrigerator compartment.

The refrigerator according to a fourth aspect of the present invention is the refrigerator according to the first to third aspects, wherein the freezing compartment and the refrigerating compartment are arranged vertically adjacent to each other, and the return duct is provided at a partition part which vertically partitions the two compartments. It is characterized by being formed.

A refrigerator according to a fifth aspect of the present invention is the refrigerator according to the first to third aspects, wherein a freezer-side damper for opening and closing the suction port on the freezer side of the common duct and a suction port for the refrigerator compartment on the common duct are opened and closed. When the freezer compartment side damper is provided, the freezer compartment side damper is closed, the refrigerator compartment side damper is opened, the common duct is used as a refrigerator compartment duct, and the freezer compartment side damper is open. The refrigerating compartment side damper is closed, and the common duct is used as a freezing compartment duct.

As described above, by providing two dampers for opening and closing the two suction ports of the common duct, respectively, and operating these dampers, the common duct can be switched between the freezer compartment and the refrigerator compartment.

A refrigerator according to a sixth aspect of the present invention is the refrigerator according to any one of the first to third aspects, further comprising a damper for opening and closing a suction port on the freezing room side and a suction port on the refrigerating room side of the common duct. When the suction port on the compartment side is closed, the suction port on the refrigerating compartment side is opened, the common duct becomes a duct for the refrigerating compartment, and when the damper opens the suction port on the freezing compartment side, the suction on the refrigerating compartment side is performed. The mouth is closed, and the common duct becomes a freezer duct.

As described above, it is also possible to provide one damper for opening and closing the two suction ports of the common duct, and to switch the common duct between the one for the freezer compartment and the one for the refrigerator compartment with this one damper.

A refrigerator according to a seventh aspect of the present invention is the refrigerator according to the first aspect, further comprising: a temperature detector for detecting a temperature of one of the freezer compartment and the refrigerator compartment; A control unit that opens and closes a suction port of the duct, wherein the control unit switches the common duct to the one-side duct when the temperature detected by the temperature detection unit is equal to or higher than a predetermined temperature.

In the above, the common duct is usually a duct for the other, and is switched to the duct for the one when the detected temperature of the one becomes higher than a predetermined temperature.

[0024] The refrigerator according to claim 8 is provided with a return duct for returning cold air in the freezer compartment and the refrigerator compartment to the evaporator, wherein the return duct includes a freezer compartment duct having a suction port on the freezer compartment side, and a refrigerator compartment. A rib for the refrigerator compartment having a suction port on the side, and a part of the rib is movably provided to change a sectional area ratio between the freezer compartment duct and the refrigerator compartment duct. Features.

In the above, a part of the rib for separating the freezer compartment duct and the refrigerator compartment duct is provided movably, and by operating this part of the rib, the freezer compartment duct and the refrigerator compartment duct are operated. Since the cross-sectional area ratio of the duct can be changed, the ratio of the heat exchange area of the cool air sent from each chamber back to the evaporator can be changed. Therefore, for example, when a large load is applied to the freezing compartment, the cross-sectional area ratio of the freezing compartment duct is increased to increase the heat exchange area in the evaporator, thereby improving the cooling performance of the freezing compartment. .

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to the drawings.

The refrigerator 10 according to this embodiment includes a freezer compartment 12
10 and 11 except for the configuration of the return duct 50 for returning the cold air in the refrigerator compartments 14 and 16 to the evaporator 24.
Has the same configuration as the conventional refrigerator described above with reference to FIG. Therefore, hereinafter, the configuration of the return duct 50 will be described in detail. In the following description, components denoted by the same reference numerals as those in the related art indicate the same components unless otherwise specified.

FIG. 1 shows a return duct 50 according to this embodiment.
(A) is a front sectional view, (b)
Indicates a plane cross section.

The return duct 50 is provided in a horizontal partition 20 for separating the freezing compartment 12 and the vegetable compartment 16 and has five rows extending in the front-rear direction by four ribs 52 extending in the front-rear direction. It is divided into. Among them, ducts 54 on both sides are freezer compartment ducts having suction ports 55 opening on the freezer compartment 12 side at the front end of the partition 20, and suck the cool air in the freezer compartment 12 to evaporate the evaporator 24. Send it back to Two rows of ducts 56, 56 inside it
Is a refrigerator compartment duct having suction ports 57, 57 at the front end of the partition 20, which are open to the vegetable compartment 16 side.
The cool air in 6 is sucked and returned to the evaporator 24. And
A central row of ducts 58 is a shared duct having both a suction port 59 opening to the freezing compartment 12 and a suction port 60 opening to the vegetable compartment 16.

The suction ports 55, 57, 5 of these ducts
9 and 60 have the same length D and a width 54
(Wf): Duct 56 for refrigerator compartment (Wr): Common duct 5
8 (Wc) = 3: 2: 2, and the cross-sectional shape of each duct 54, 56, 58 is set to a shape corresponding to this. Thereby, the suction port area ratio and the cross-sectional area ratio of the return duct 50 are both 3: 2: 1 for freezer compartment: for refrigerator compartment: common.

The suction ports 59 and 60 of the common duct 58 are formed such that the suction port 59 of the freezing compartment 12 is shifted downstream from the suction port 60 of the vegetable compartment 16. The suction port 59 on the freezer compartment 12 side is provided with a freezer compartment side damper 62 for opening and closing it, and the suction port 60 on the vegetable compartment 16 side is provided with a refrigerator compartment side damper 64 for opening and closing it. As shown in FIGS. 2 and 3, these dampers 62 and 64 include a motor 65 and a damper flap 67 connected via a reduction gear 66, and the motor 65 and the reduction gear 66 are installed in the partition 20. , The damper flap 67 is the suction port 5
It is configured such that it rotates inside the duct 58 from the closed state of 9, 60 to open state.

The common duct 58 is connected to the freezer-side damper 6.
When the refrigerator compartment damper 64 is open while the refrigerator compartment 2 is closed, a cool air duct inside the vegetable compartment 16 is sucked through the suction port 60 on the vegetable compartment 16 side, and the cold air is sent back to the evaporator 24. Become. On the other hand, when the freezer compartment side damper 62 is open and the refrigerating compartment side damper 64 is closed, the cool air in the freezer compartment 12 is sucked from the suction port 59 on the freezer compartment 12 side and sent back to the evaporator 24. It becomes a duct for the freezer compartment.

As shown in FIG. 4, a freezing room side damper 62 and a refrigeration room side damper 64 are controlled by a control unit 42 for controlling the opening and closing thereof.
The controller 42 is connected to a freezer compartment sensor 40 for detecting the temperature of the freezer compartment 12, a refrigerator compartment sensor 38 for detecting the temperature of the refrigerator compartment 14, and the compressor 28. In addition, as shown in FIG.
Is disposed on the upper rear surface of the refrigerator 10, the freezer compartment sensor 40 is disposed on the rear surface of the freezer compartment 12, and the refrigerator compartment sensor 38 is disposed on the rear surface of the refrigerator compartment 14.

FIG. 5 shows an example of control of the dampers 62 and 64.

In step a 1, it is determined whether or not the temperature of the freezer compartment 12 (T _F : the temperature detected by the freezer compartment sensor 40) is equal to or higher than a predetermined compressor ON temperature (T _ON ). As a result, if _TF is equal to or greater than T _ON , step a2
Proceed to.

In step a2, the compressor 28 and the fan 26 are turned on, and the process proceeds to step a3. Thereby, cool air is sent into the freezing room 12 and the refrigerating rooms 14 and 16.

In step a3, control is performed so that the freezer compartment side damper 62 is in the open state and the refrigerator compartment side damper 64 is in the closed state, and the process proceeds to step a4. At this time, since the common duct 58 is a duct for the freezer compartment, the suction port area ratio and the cross-sectional area ratio of the return duct 50 are both freezer compartment: refrigerator compartment = 4: 2. Therefore, the freezer compartment 12 has a larger amount of cool air and a larger heat exchange area in the evaporator 24 than the refrigerating compartments 14 and 16, and the cooling performance of the freezer compartment 12 is higher.

In step a 4, it is determined whether or not the temperature of the refrigerator compartment 14 (T _R : the temperature detected by the refrigerator compartment sensor 38) is lower than a predetermined damper opening / closing temperature (T _D ).
Step a5 is less than _D, the flow proceeds to step a7 equal to or greater than _{T D.}

In step a 7, control is performed such that the freezer compartment side damper 62 is closed and the refrigerator compartment side damper 64 is opened, and the process proceeds to step a 8. As a result, the common duct 58 is switched to a refrigerator compartment duct, and the suction port area ratio and the sectional area ratio of the return duct 50 are both for the freezer compartment:
For the refrigerator compartment = 3: 3. Therefore, the refrigerator compartments 14, 16
On the side, the amount of cold air and the heat exchange area are increased, so that cooling of the refrigerator compartments 14 and 16 is promoted. And
If the temperature T _R of the refrigerating compartment 14 becomes less than the damper temperature T _D (step a8), the process returns to step a3, the freezer compartment damper 62 to the open state, the refrigerating compartment damper 64 closed, the shared duct 58 To the freezer duct.

In step a 5, the temperature _TF of the freezer compartment 12 is reduced to a predetermined compressor OFF temperature (T _OFF ).
It is determined whether or not the pressure is equal to or less than T. If _TF is equal to or less than T _OFF , the process proceeds to step a6 and the compressor 28 is turned off. If _TF is higher than T _OFF , the process returns to step a4.

[0041] Thus, when controlling the opening and closing of the damper 62, 64 on the basis of to on the detected temperature detected temperature _{T R} of the refrigerating compartment 14, for example, the damper opening and closing the temperature _{T D,} T
By setting the _D ≧ 5 ° C., a temperature _{T R} of the refrigerating compartment 14
Is 5 ° C. or more, the common duct 58 becomes a duct for the refrigerator compartment, and the cooling performance of the refrigerator compartments 14 and 16 is improved.

As described above, in the refrigerator 10 of the present embodiment, only the freezer compartment side damper 62 is normally open and the common duct 58 is a duct for the freezer compartment, and the temperature of the refrigerating compartment 14 is lower than a predetermined temperature. Is higher, the freezer compartment side damper 62 is closed and the refrigerator compartment side damper 64 is opened to open the common duct 58.
Is switched to a duct for the refrigerator compartment to increase the amount of cold air in the refrigerator compartments 14 and 16 whose temperature has risen, and to increase the heat exchange amount of the cool air sent back from the vegetable compartment 16 to the evaporator 24.
The temperature of the refrigerator compartments 14 and 16 can be quickly reduced.

In the above description, the dampers 62, 64
The opening and closing of the refrigerator is performed by detecting the temperature of the refrigerator compartment 14 and based on the detection result, but instead or simultaneously with this, the temperature of the freezer compartment 12 or each compartment 12, 1
The opening times of the doors 4 and 16 may be detected, and the opening and closing of the dampers 62 and 64 may be controlled based on the detection result.

FIG. 6 shows a return duct 5 showing a modification of the damper structure of the common duct 58 in the above embodiment.
0 is a sectional view.

In this case, the common duct 58 is provided with one damper 68 for opening and closing the two suction ports 59 and 60. The damper 68 is rotatably attached to the opening edge of the suction port 59 on the freezer compartment 12 side, and is horizontally mounted on the freezer compartment 1.
The suction port 59 on the side of the vegetable compartment 16 is opened by closing the suction port 59 on the side of the vegetable compartment 16 and the suction port 60 on the side of the vegetable compartment 16 is opened in a vertical state. . The common duct 58 serves as a refrigerator compartment duct when the damper 68 is in the horizontal state, and serves as a freezer compartment duct when the damper 68 is in the vertical state.

As described above, the two suction ports 59 and 60 of the common duct 58 can be opened and closed by the single damper 68 so that the common duct 58 can be switched between the freezer compartment and the refrigerator compartment.

FIG. 7 shows a return duct 70 according to a second embodiment of the present invention.

The return duct 70 of this embodiment is a common duct in which the refrigerator compartment duct of the conventional return duct shown in FIG. 12 is used. That is, the return duct 70 has two ribs 52, 52 extending in the front-rear direction.
Are divided into three rows by ducts 5 on both sides thereof.
Reference numerals 4 and 54 denote freezer compartment ducts, and a central duct 58 is a common duct having both a suction port 59 on the freezer compartment 12 side and a suction port 60 on the vegetable compartment 16 side.

In this embodiment, the width of the suction ports 55, 59, 60 of each duct is set to the width of the freezer compartment duct 54 (W
f): The common duct 58 (Wc) = 1: 1 is formed, and the suction port area ratio and the cross-sectional area ratio of the return duct 50 are both set to 2: 1 for the freezer compartment: common.

Also in this embodiment, the common duct 58
As in the first embodiment, the suction ports 59 and 60 of
Two or one damper 62, 64 or 68 is mounted, and by operating it, the common duct 58 is mounted.
Can be switched between a refrigerator compartment and a freezer compartment.

In this embodiment, since the return duct 70 includes the freezer compartment duct 54 and the common duct 58,
In a normal state, the common duct 58 is used for the vegetable compartment 16.
The inlet 60 on the side is open to form a duct for a refrigerator compartment. Then, when the freezing compartment 12 is overloaded, such as when the temperature of the freezing compartment 12 rises significantly, the suction port 59 on the freezing compartment 12 side is opened, and the suction port 60 on the vegetable compartment 16 side is closed, and the common use is performed. The duct 58 is a duct for a freezing room. As a result, all the return ducts 70 become ducts for the freezer compartment, and the amount of cold air and the amount of heat exchange on the freezer compartment 12 side are increased, so that the cooling performance of the freezer compartment 12 is improved.

In this embodiment, the control method of the first embodiment can be used as a method of controlling the switching of the common duct 58. In this case, the temperature of the freezing compartment 12 is detected, and this detection is performed. When the temperature is equal to or higher than a predetermined damper opening / closing temperature, the common duct 58 may be switched from the refrigerator compartment to the freezer compartment.

In the above description, the return duct 70
Is composed of a refrigerator compartment duct and a common duct, and this common duct is used as a freezer compartment duct in a normal state, and is switched to a refrigerator compartment duct when the refrigerator compartment becomes overloaded. Thus, the entire return duct may be configured as a duct for the refrigerator compartment to improve the cooling performance of the refrigerator compartment. In this case, when controlling the duct switching, the temperature of the refrigerator compartment may be detected.

FIG. 8 shows a return duct 80 according to a third embodiment of the present invention.

The return duct 80 of this embodiment is a conventional return duct shown in FIG. 12 in which a part of a rib for partitioning each duct is made movable. In other words, the return duct 80 is divided into two freezer compartment ducts 54 on both sides and a refrigerator compartment duct 56 on the center by two ribs 52 extending in the front-rear direction.
The two ribs 52, 52 are movable ribs 82 at the center. This movable rib 8
The front ends of the motors 2 and 82 are attached to vertical turning shafts 84 and 84 connected to a motor (not shown), and the turning shafts 84 and 84 turn as shown in FIG. The cross-sectional area ratio between the freezer compartment ducts 54 and 54 and the refrigerator compartment duct 56 is changed.

In this embodiment, the movable ribs 84, 8
4, each duct 54,5, as shown in FIG.
4, 56 have the same sectional area ratio.
When the freezing compartment 12 is in an overloaded state, such as when the temperature of the freezing compartment 12 is excessively increased, the movable ribs 82, 82 rotate toward the refrigerator compartment duct 56 as shown in FIG. The cross-sectional area ratio of the freezer compartment ducts 54, 54 is increased. That is, as indicated by an arrow F, the cool air sucked from the freezing compartment 12 is
It also flows into the refrigerator compartment duct 56, and the refrigerator compartment duct 56
The rear part also acts as a duct for the freezer compartment. Therefore, the cool air sucked from the freezing room 12 is subjected to heat exchange in almost the entire evaporator 24, that is, the freezing room 12
The ratio of the heat exchange area of the cool air sent back to the evaporator 24 increases, and the cooling performance of the freezing compartment 12 can be improved. Conversely, when it is desired to increase the cooling performance of the refrigerator compartments 14, 16, the movable ribs 82, 82 are connected to the freezer duct 54,
54 (refer to 82 ', 8 in FIG. 9).
2 ').

[0057]

According to the refrigerator of the first aspect, a common duct is provided as a return duct in addition to the freezer compartment duct and the refrigerator compartment duct, and the common duct can be switched between the freezer compartment and the refrigerator compartment. Therefore, when a large load is applied to the freezing room or the refrigerator compartment, the cooling performance can be improved by switching the shared duct to a duct for the room where the load is applied.

In the refrigerator according to the second aspect of the present invention, a freezer compartment duct and a common duct are provided as return ducts, and the common duct can be switched between a freezer compartment and a refrigerator compartment. When a load is applied, all return ducts can be used as freezer compartment ducts, thereby improving the cooling performance of the freezer.

According to the refrigerator of the third aspect, a duct for a refrigerator and a common duct are provided as return ducts, and the common duct can be switched between a refrigerator and a refrigerator. When a load is applied, all of the return ducts can be used as refrigerator compartment ducts to improve the cooling performance of the refrigerator compartment.

According to the refrigerator of the present invention, a part of the rib for dividing the return duct into the duct for the freezer compartment and the duct for the refrigerator compartment is made movable so that the sectional area ratio of both ducts can be changed. When a large load is applied to the room or the refrigeration room, the cooling performance can be improved by increasing the sectional area ratio of the duct for the room where the load is applied.

[Brief description of the drawings]

FIG. 1 is a view showing a structure of a return duct 50 according to a first embodiment of the present invention, wherein FIG.
(B) is a sectional plan view.

FIG. 2 shows a common duct 5 in the return duct 50.
8 is an enlarged sectional view of a main part of FIG.

FIG. 3 is a perspective view of a damper 62 of the common duct 58.

FIG. 4 is a block diagram for controlling duct switching in the common duct 58;

FIG. 5 is a flowchart for controlling duct switching in the common duct 58;

FIG. 6 is a sectional view of a return duct 50 showing a modified example of the damper in the embodiment.

FIG. 7 is a view showing a structure of a return duct 70 according to a second embodiment of the present invention, wherein (a) is a front sectional view,
(B) is a sectional plan view.

FIG. 8 is a plan sectional view showing a structure of a return duct 80 according to a third embodiment of the present invention.

FIG. 9 is a plan sectional view of a return duct 80 showing an operation state of a movable rib 82 in the embodiment.

FIG. 10 is a longitudinal sectional view of a conventional refrigerator.

FIG. 11 is a front view of a conventional refrigerator in which a door is omitted.

12A and 12B are diagrams showing a return duct structure in a conventional refrigerator, wherein FIG. 12A is a front sectional view, and FIG. 12B is a plan sectional view.

[Explanation of symbols]

 10 refrigerator 12 freezer compartment 14 refrigerator compartment 16 vegetable compartment 20 partitioning section 24 evaporator 38 refrigerator compartment sensor 40 freezer compartment sensor 42 control section 50, 70 80 ... return duct 54 ... freezer compartment duct 55 ... freezer compartment duct inlet 56 ... refrigerator compartment duct 57 ... refrigerator compartment duct inlet 58 ... common duct 59, 60 ... common Duct inlets 62, 64, 68 ... Common duct damper 82 ... Movable rib

Claims (8)

[Claims] A return duct for returning cool air in the freezer compartment and the refrigerator compartment to the evaporator, wherein the return duct includes a freezer compartment duct having a freezer compartment side suction port and a refrigerator compartment side suction port. And a common duct having both a suction port on the freezer compartment side and a refrigerator compartment side, and by opening and closing the suction port of the common duct, the common duct is used for the freezer compartment and for the refrigerator compartment. A refrigerator characterized in that it can be switched between and. And a return duct for returning cold air in the freezer compartment and the refrigerator compartment to the evaporator, wherein the return duct is a freezer compartment duct having a freezer compartment side suction port, a freezer compartment side and a refrigerator compartment side. A refrigerator comprising: a common duct having both suction ports; opening and closing the suction port of the common duct so that the common duct can be switched between a refrigerator room and a refrigerator room. A return duct for returning cold air in the freezer compartment and the refrigerator compartment to the evaporator, wherein the return duct includes a refrigerator compartment duct having a refrigerator compartment suction port, a freezer compartment side and a refrigerator compartment side. A refrigerator comprising: a common duct having both suction ports; opening and closing the suction port of the common duct so that the common duct can be switched between a refrigerator room and a refrigerator room. 4. The refrigerator according to claim 1, wherein the freezing compartment and the refrigerating compartment are arranged vertically adjacent to each other, and the return duct is formed in a partition that vertically separates the two compartments.
The refrigerator according to any one of the preceding claims. 5. A freezer compartment damper for opening and closing a suction port on the freezer side of the common duct, and a refrigerating compartment side damper for opening and closing a suction port on the refrigerator compartment side of the common duct. When the refrigerator is closed, the refrigerating compartment side damper is opened, the common duct is used as a duct for the refrigerating compartment, and when the freezing compartment side damper is open, the refrigerating compartment side damper is closed, and the common duct is frozen. The refrigerator according to any one of claims 1 to 3, wherein the refrigerator is a duct for a room. 6. A damper for opening and closing a suction port on the freezer compartment side and a suction port on the refrigerator compartment side of the common duct, wherein the damper closes the suction port on the freezer compartment side when the damper closes the suction port on the freezer compartment side. When the suction port is opened and the common duct becomes a duct for the refrigerator compartment, and when the damper opens the suction port on the freezer compartment side, the suction port on the refrigerator compartment side closes and the common duct becomes a duct for the freezer compartment. Claims 1-3 characterized by the above-mentioned.
The refrigerator according to any one of the preceding claims. 7. A temperature detecting unit for detecting a temperature of one of the freezing compartment and the refrigerating compartment, and a control unit for opening and closing a suction port of the common duct based on a temperature detected by the temperature detecting unit. The refrigerator according to claim 1, wherein the control unit switches the common duct to the one-side duct when the temperature detected by the temperature detecting unit is equal to or higher than a predetermined temperature. 8. A return duct for returning cold air in the freezer compartment and the refrigerator compartment to the evaporator, wherein the return duct is connected to a freezer compartment duct having a freezer compartment side suction port and a refrigerator compartment side suction port. A refrigerator having a refrigerator compartment duct, wherein a part of the rib is movably provided to change a sectional area ratio between the freezer compartment duct and the refrigerator compartment duct.